Rectifier device



Jan. 23, 1940. A. GOTTSCHALK. Er AL 2,

' RECTIFIER DEVICE Filed May 25, 1958 (9- lnvenfol's:

Jiforne;

Patented Jan. 23, 1940 UNITED STATES PATENT OFFICE RECTIFIER DEVICEcompany Application May 25, 1938, Serial No. 209,972

In Germany May 29, 1937 4 Claims.

The present invention relates to rectifier devices, and morespecifically to dry-rectiflers comprising a plurality of individualunits such as metal rectifiers, metal oxide rectifiers or sul- 6' phiderectifiers.

Rectifier'devices adapted to operate at high tensions are generallycomposed of a given number of similar rectifying units connected intandem fashion with intermediate members of inv 10 sulation particularlyof annular shape arranged therebetween. As a matter of fact, thematerial or materials used for manufacturing these intermediate membersof insulation frequently involve a shrinking and destroying tendency in15 response to the temperature augment introduced on account of therectification action so that after a longer use the column of rectifyingunits requires readjustment particularly with respect to compressionalstresses in cases that the indi- 20 vidual units of the rectifier aremounted on a spindle common thereto.

The aforesaid difiiculties are avoided according to the presentinvention which proposes the previously employed material of insulationfor 25 making the rectifier unit spacing members to be replaced by ametal or metals, and either to providethin foils or sheets 01'insulation between the metallic rectifier units and these metallicmembers, or toemploy a metal or metals, the

80 superficies of which consists of arigid and nonconductive material.Such spacing members may, by way of an example, consist of aluminium aplurality of dry-rectifying units each of which is generally designatedas 2. Each of these elementswhicharearrangedoneabovetheother on aspindle I common thereto may, for instance, consist of a layer 3 ofselenium applied on an iron plate 4 and having its outer surface coveredby a conductive electrode 5. The interspace between the individualrectifying units 2 is given 5 by the width of a metal ring 6 which iselectrically insulated from the metallic portions of the adjacentrectifying unit by means of a layer I of insulation 6'. v

The metal rings 6 may be provided with a large 10 groove on one side inorder to increase the leakage path.

What is claimed is:

1. A multi-unit dry-rectifier device comprising a plurality ofindividual rectifier units, intermediate members of metal arrangedbetween each 'two of said rectifier units and adapted to provide a givenspace therebetween, and thin layers of insulation for electricallyseparating said rectifier units and said members of metal.

2. A multi-unit dry-rectifier device comprising a plurality ofindividual rectifier units, intermediate annular members of metalarranged between each two of said rectifier units and adapted to providea given space therebetween, and thin layers of insulation forelectrically separating said rectifier units and said members of metal.

3. A multi-unit dry-rectifier device comprising a plurality 0!individual rectifier units, inter- 80 mediate annular members ofaluminium arranged between each two of said rectifier units and adaptedto provide a given space therebetween, and thin layers of insulation forelectri- I cally separating said rectifier units and said members ofmetal, said layers being provided on the superficies 0! said members byoxidation.

4. A- multi-unit dry-rectifier device as defined in claim 2. in whichone side of said annular members of metal is provided with a groove. 4

ALBERT GO'I'I'SCHALK. ALBRECHT GEISSELSODER.

